Flow resistance testing apparatus

Abstract

This application discloses a flow resistance testing device, which includes multiple liquid storage tanks, a liquid pump, a first pressure gauge, and a second pressure gauge. The multiple liquid storage tanks are arranged at different heights, and each liquid storage tank is connected to an inlet pipe and an outlet pipe. The liquid storage tanks are used to contain coolant and flow-blocking components. The pump inlet of the liquid pump is connected to the liquid path of the outlet pipe, and the pump outlet of the liquid pump is connected to the liquid path of the inlet pipe to provide power for the flow of coolant. The first pressure gauge is installed on the inlet pipe, and the second pressure gauge is installed on the outlet pipe. The flow resistance testing device of this application, by arranging multiple liquid storage tanks at different heights and using the first and second pressure gauges to detect the inlet and outlet liquid pressures of the liquid storage tanks, can simultaneously test the flow resistance of liquid storage tanks at different heights. This is suitable for comparing the flow resistance of liquid storage tanks at different heights, thereby providing a data basis for the design of liquid cooling systems for devices with multiple battery packs.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a flow resistance testing device. Background Technology

[0002] Battery packs and similar devices generate significant heat during charging and discharging. In related technologies, to dissipate heat, the battery pack can be immersed in a cooling tank, where a circulating coolant cools it. The flow resistance within the cooling tank is a key factor in battery pack heat dissipation. Therefore, how to test the flow resistance within the cooling tank is a technical problem that needs to be solved. Utility Model Content

[0003] This application provides a flow resistance testing device.

[0004] The flow resistance testing device according to this application includes multiple liquid storage tanks, a liquid pump, a first pressure gauge, and a second pressure gauge. The multiple liquid storage tanks are arranged at different heights, and each liquid storage tank is connected to an inlet pipe and an outlet pipe. The liquid storage tanks are used to contain coolant and a flow-blocking component, and the flow-blocking component is used to create resistance to the flow of the coolant. The pump inlet of the liquid pump is connected to the liquid path of the outlet pipe, and the pump outlet of the liquid pump is connected to the liquid path of the inlet pipe to provide power for the flow of the coolant. The first pressure gauge is installed on the inlet pipe, and the second pressure gauge is installed on the outlet pipe.

[0005] The flow resistance testing device of this application sets multiple liquid storage tanks at different heights and uses a first pressure gauge and a second pressure gauge to detect the inlet and outlet liquid pressures of the liquid storage tanks. This allows for simultaneous testing of the flow resistance of liquid storage tanks at different heights, making it suitable for comparing the flow resistance of liquid storage tanks at different heights, thereby providing a data basis for the design of liquid cooling systems for devices with multiple battery packs.

[0006] In some embodiments, the flow resistance testing device includes an adjustment component for adjusting the coolant inlet parameters of at least one of the reservoirs.

[0007] In some embodiments, the flow resistance testing device includes a common liquid delivery pipe and a delivery pipe, with multiple inlet pipes connected to the common liquid delivery pipe, and the delivery pipe connected to the pump outlet of the liquid pump and the common liquid delivery pipe.

[0008] In this way, the liquid pump can pump the coolant into the storage tank through the common delivery pipe and the conveying pipe.

[0009] In some embodiments, the common liquid delivery pipe is vertically arranged, and multiple liquid inlet pipes are respectively connected to different height positions of the common liquid delivery pipe.

[0010] Thus, the vertically installed common liquid delivery pipe has different pressures at different heights, which allows for testing of the flow resistance of coolant entering the reservoir from different heights.

[0011] In some embodiments, there are two delivery pipes, which are connected to the common liquid delivery pipe at different heights. One delivery pipe is connected to the common liquid delivery pipe at a position higher than the highest position where the multiple inlet pipes are connected to the common liquid delivery pipe, and the other delivery pipe is connected to the common liquid delivery pipe at a position lower than the lowest position where the multiple inlet pipes are connected to the common liquid delivery pipe.

[0012] In this way, the two delivery pipes are connected at different heights to the common liquid delivery pipe, allowing the liquid pump to deliver coolant to the storage tank from different positions, thereby changing the different inlet pressures of the storage tank and testing the flow resistance of the storage tank under different pressures.

[0013] In some embodiments, each of the delivery pipes is equipped with a switch for opening and closing the delivery pipes, allowing one of the two delivery pipes to be connected to the common delivery pipe. This allows for comparison of the effect of different delivery pipes on flow resistance when supplying liquid to the storage tank.

[0014] In some embodiments, the flow resistance testing device further includes a reflux pipe and a reflux box, with multiple outlet pipes connected to the reflux pipe, one end of the reflux pipe connected to the reflux box, and the reflux box connected to the pump inlet via a pipeline.

[0015] In this way, the return tank can temporarily store coolant, making it easier for the liquid pump to pump the coolant from the return tank into the reservoir, so that the coolant can circulate and is beneficial for testing the fluid in the reservoir.

[0016] In some embodiments, the regulating assembly includes at least one of a pressure control valve and a flow control valve disposed on each of the inlet pipes.

[0017] Thus, when a pressure control valve is installed on the inlet pipe, the pressure control valve can control the inlet pressure of the storage tank; when a flow control valve is installed on the inlet pipe, the flow control valve can control the inlet flow of the storage tank.

[0018] In some embodiments, each of the inlet pipes is equipped with a flow meter. Thus, by installing a flow meter on the inlet pipe, the inlet flow rate of the storage tank can be obtained from the flow meter reading.

[0019] In some embodiments, the liquid storage tank is provided with multiple liquid inlet connectors, which are located at different heights, and one of the liquid inlet connectors is connected to the liquid inlet pipe.

[0020] In this way, coolant can flow into the reservoir from one of the inlet connectors, thus allowing testing of the relationship between inlet location and flow resistance.

[0021] In some embodiments, a level gauge is provided on the outside of the reservoir to indicate the liquid level inside the reservoir. This level gauge indicates the liquid level inside the reservoir, facilitating the control of the coolant within the reservoir.

[0022] In some embodiments, the flow resistance testing equipment includes an overflow tank disposed below all the reservoirs, the overflow tank having an opening facing the reservoirs. Thus, the overflow tank can collect coolant overflowing from the reservoirs, reducing coolant pollution to the surrounding environment.

[0023] In some embodiments, the flow-blocking component is detachably connected to the liquid storage tank.

[0024] In some embodiments, the flow resistance testing equipment further includes a support, on which multiple liquid storage tanks are arranged at different heights.

[0025] In some embodiments, the total height of the support is less than or equal to 2m. This results in a lower height for the flow resistance testing equipment, facilitating indoor use and convenient measurement of the flow resistance of the storage tank.

[0026] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0027] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, wherein:

[0028] Figure 1 This is a three-dimensional schematic diagram of the flow resistance testing device according to an embodiment of this application.

[0029] Explanation of reference numerals in the attached figures:

[0030] 100-Flow resistance testing equipment, 10-Bracket, 11-Longitudinal beam, 12-Crossbeam, 13-Base, 20-Storage tank, 21-Inlet pipe, 22-Outlet pipe, 23-Inlet connector, 24-Level gauge, 30-Liquid pump, 31-Pump inlet, 32-Pump outlet, 41-First pressure gauge, 42-Second pressure gauge, 50-Adjusting assembly, 51-Common delivery pipe, 52-Transfer pipe, 53-Pressure control valve, 54-Flow control valve, 55-Switch, 60-Flow meter, 80-Return pipe, 91-Return box, 92-Overflow box, 110-Control box. Detailed Implementation

[0031] The embodiments of this application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0032] In the description of this application, it should be understood that the terms "longitudinal", "lateral", "length", "width", "upper", "lower", "front", "rear", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0034] The following disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0035] In related technologies, energy storage systems with multiple battery packs, such as energy storage cabinets, often involve stacking some battery packs or placing them at different heights. The battery packs can dissipate heat through liquid cooling by immersing them in a storage tank. The coolant circulates through the tank, carrying away the heat generated by the battery packs. The flow resistance of the storage tank is a key factor in cooling; different flow resistances result in varying heat dissipation capacities of the coolant. When using the same liquid pump to power the coolant, the liquid pressure and flow rate at different heights may differ, leading to varying flow resistance within the storage tank. Therefore, flow resistance testing of storage tanks at different heights is necessary to provide a basis for the design of the liquid cooling system in energy storage systems.

[0036] Please see Figure 1 The flow resistance testing device 100 of this application includes multiple liquid storage tanks 20, a liquid pump 30, a first pressure gauge 41, and a second pressure gauge 42. The multiple liquid storage tanks 20 are arranged at different heights. Each liquid storage tank 20 is connected to an inlet pipe 21 and an outlet pipe 22. The liquid storage tank 20 is used to contain coolant and a flow-blocking component (not shown). The flow-blocking component is used to create resistance to the flow of the coolant. The pump inlet 31 of the liquid pump 30 is connected to the liquid passage of the liquid storage pipe, and the pump outlet 32 ​​of the liquid pump 30 is connected to the liquid passage of the inlet pipe 21 to provide power for the flow of coolant. The first pressure gauge 41 is installed on the inlet pipe 21, and the second pressure gauge 42 is installed on the outlet pipe 22.

[0037] The flow resistance testing device 100 of this application sets multiple liquid storage tanks 20 at different heights and uses a first pressure gauge 41 and a second pressure gauge 42 to detect the inlet and outlet liquid pressure of the liquid storage tanks 20. This allows for simultaneous testing of the flow resistance of liquid storage tanks 20 at different heights, making it suitable for comparing the flow resistance of liquid storage tanks 20 at different heights, thereby providing a data basis for the design of liquid cooling systems for devices with multiple battery packs.

[0038] In one embodiment, the flow resistance testing device 100 may further include a support 10, on which multiple liquid reservoirs 20 are arranged at different heights. The support 10 may be constructed from overlapping profiles. For example, the support 10 may utilize aluminum profiles and be formed by bolting. Figure 1 As shown, the support 10 includes a longitudinal beam 11 and a crossbeam 12 connected to the longitudinal beam 11. Multiple crossbeams 12 can be connected at different height positions of the longitudinal beam 11 to form placement positions with different heights, and the liquid storage tank 20 is placed in the corresponding placement position.

[0039] The reservoir 20 is used to contain coolant and a flow-blocking assembly. The coolant may be, for example, a cooling oil with insulating properties. The flow-blocking assembly may include a baffle plate, which can simulate the resistance of the battery pack to the coolant. In one example, the flow-blocking assembly may be detachably connected to the reservoir 20 to facilitate the replacement of flow-blocking assemblies with different resistances, thereby allowing for different flow resistance tests on the reservoir 20.

[0040] The number of liquid storage tanks 20 can be 2, 3, 4, etc. Multiple liquid storage tanks 20 can be arranged at equal height intervals. Furthermore, multiple liquid storage tanks 20 can be aligned vertically. Figure 1 In the example, there are 4 liquid storage tanks 20, which are set at different heights.

[0041] The liquid pump 30 can be mounted on the bracket 10. For example, the liquid pump 30 can be fixed to the bracket 10 with screws, making the position of the liquid pump 30 more stable. It can be understood that the liquid pump 30 can draw in coolant from the pump inlet 31, pressurize the coolant, and spray it out from the pump outlet 32.

[0042] The first pressure gauge 41 and the second pressure gauge 42 can respectively measure the coolant pressure in the inlet pipe 21. Based on the pressure difference measured by the first pressure gauge 41 and the second pressure gauge 42, the flow resistance of the coolant through the reservoir 20 can be calculated.

[0043] like Figure 1 As shown, in some embodiments, the flow resistance testing device 100 includes an adjustment component 50 for adjusting the coolant inlet parameters of at least one reservoir 20.

[0044] Thus, by adjusting the coolant inlet parameters of the reservoir 20 using the adjusting component 50, the relationship between different inlet parameters and the flow resistance of the reservoir 20 can be tested. Coolant inlet parameters include, but are not limited to, flow rate and pressure.

[0045] Please see Figure 1 In some embodiments, the regulating assembly 50 includes a common liquid delivery pipe 51 and a delivery pipe 52, with multiple inlet pipes 21 connected to the common liquid delivery pipe 51, and the delivery pipe 52 connected to the pump outlet 32 ​​of the liquid pump 30 and the common liquid delivery pipe 51.

[0046] Thus, the liquid pump 30 can pump coolant into the storage tank 20 through the common liquid delivery pipe 51 and the delivery pipe 52. Specifically, after the liquid pump 30 pumps the coolant into the common liquid delivery pipe 51 through the delivery pipe 52, the coolant can be diverted from the common liquid delivery pipe 51 to each inlet pipe 21, and then flow into the storage tank 20 through the inlet pipe 21. Since the common liquid delivery pipe 60 can act as a diversion pipe, it can adjust the inlet parameters of each storage tank 60.

[0047] Please see Figure 1 In some embodiments, the common liquid delivery pipe 51 is vertically arranged, and multiple liquid inlet pipes 21 are respectively connected to different height positions of the common liquid delivery pipe 51. It can be understood that the common liquid delivery pipe 51 has different pressures at different height positions. When multiple liquid inlet pipes 21 are respectively connected to different height positions of the common liquid delivery pipe 51, under roughly the same conditions, the pressure of the coolant entering the different liquid inlet pipes 21 is different, thereby allowing the effect between different pressures and flow resistance to be tested.

[0048] Therefore, the vertically arranged common liquid delivery pipe 51 has different pressures at different heights, which allows for testing of the flow resistance of coolant entering the reservoir 20 from different heights.

[0049] Please see Figure 1 In some embodiments, there are two delivery pipes 52, which are connected to different heights of the common liquid delivery pipe 51. One delivery pipe 52 is connected to the common liquid delivery pipe 51 at a position higher than the highest position where the multiple inlet pipes 21 are connected to the common liquid delivery pipe 51, and the other delivery pipe 52 is connected to the common liquid delivery pipe 51 at a position lower than the lowest position where the multiple inlet pipes 21 are connected to the common liquid delivery pipe 51.

[0050] It is understandable that the closer to the inlet of the delivery pipe 52, the higher the pressure of the coolant. Thus, the two delivery pipes 52 are connected to different height positions of the common liquid delivery pipe 51, so that the liquid pump 30 can deliver coolant to the liquid storage tank 20 from different positions to change the different liquid inlet pressures of the liquid storage tank 20, thereby testing the flow resistance of the liquid storage tank 20 under different pressures.

[0051] In one embodiment, the two delivery pipes 52 can selectively deliver coolant or deliver coolant simultaneously.

[0052] Please see Figure 1 In some embodiments, each delivery pipe 52 is provided with a switch 55, which is used to open and close the delivery pipe 52. The switch 55 allows one of the two delivery pipes 52 to be connected to the common liquid delivery pipe 51. Alternatively, when the flow resistance testing equipment 100 is working, one switch 55 is open and the other switch 55 is closed. The open switch 55 allows the corresponding delivery pipe 52 to deliver coolant.

[0053] Thus, switch 55 connects one of the two delivery pipes 52 to the common liquid delivery pipe 51, allowing for a comparison of the effect of liquid entering the reservoir 20 from different delivery pipes 52 and different coolant flow paths on flow resistance.

[0054] Please see Figure 1 In some embodiments, the flow resistance testing device 100 further includes a return pipe 80 and a return box 91, a plurality of liquid outlet pipes 22 are connected to the return pipe 80, one end of the return pipe 80 is connected to the return box 91, and the return box 91 is connected to the pump inlet 31 through a pipe 93.

[0055] In this way, the return tank 91 can temporarily store the coolant, which makes it easier for the liquid pump 30 to pump the coolant from the return tank 91 into the reservoir 20, so that the coolant can circulate and is beneficial for testing the fluid in the reservoir 20.

[0056] Specifically, one end of the return pipe 80 can be closed, and the other end is connected to the return tank 91. Coolant flowing from multiple outlet pipes 22 can first flow into the return pipe 80 via its side for confluence, and then flow into the return tank 91. The return tank 91 can store a certain amount of coolant, allowing the liquid pump 30 to pump different amounts of coolant into the reservoir 20, which is beneficial for comparing the effect of different amounts of coolant on the flow resistance within the reservoir 20.

[0057] Please see Figure 1 In some embodiments, the regulating assembly 50 includes at least one of a pressure control valve 53 and a flow control valve 54 disposed on each inlet pipe 21. In one example, each inlet pipe 21 is provided with a pressure control valve 53; in another example, each inlet pipe 21 is provided with a flow control valve 54; and in yet another example, each inlet pipe 21 is provided with both a pressure control valve 53 and a flow control valve 54.

[0058] Thus, when a pressure control valve 53 is installed on the inlet pipe 21, the pressure control valve 53 can control the inlet pressure of the liquid storage tank 20; when a flow control valve 54 is installed on the inlet pipe 21, the flow control valve 54 can control the inlet flow of the liquid storage tank 20.

[0059] Specifically, the pressure control valve 53 is, for example, a pressure reducing valve, and the flow control valve 54 is, for example, a butterfly valve. When both the pressure control valve 53 and the flow control valve 54 are provided on the inlet pipe 21, the pressure control valve 53 and the flow control valve 54 can be connected in series.

[0060] Please see Figure 1 In some embodiments, a flow meter 60 is provided on each inlet pipe 21. Thus, when a flow meter 60 is provided on the inlet pipe 21, the inlet flow rate of the liquid storage tank 20 can be obtained from the flow meter 60.

[0061] Please see Figure 1 In some embodiments, the liquid storage tank 20 is provided with multiple liquid inlet connectors 23, which are located at different heights, and one of the liquid inlet connectors 23 is connected to the liquid inlet pipe 21. For example, there are two liquid inlet connectors 23, one of which is connected to the top of the liquid storage tank 20 and the other is connected to the bottom of the liquid storage tank 20.

[0062] In this way, coolant can flow into the reservoir 20 from one of the inlet connectors 23, thereby testing the relationship between the amount of coolant entering from different locations and the magnitude of the flow resistance.

[0063] Please see Figure 1In some embodiments, a level gauge 24 is provided on the outside of the reservoir 20 to indicate the liquid level inside the reservoir 20. Thus, the level gauge 24 indicates the liquid level inside the reservoir 20, facilitating the control of the coolant within the reservoir 20.

[0064] Specifically, the level gauge 24 may include a hollow tube, one end of which is connected to the top of the storage tank 20, and the other end is connected to the bottom of the storage tank 20. The hollow tube includes a light-transmitting section. When there is coolant in the storage tank 20, since the hollow tube is connected to the storage tank 20, the coolant enters the light-transmitting section of the hollow tube. The coolant level in the light-transmitting section is the same as the coolant level in the storage tank 20. Therefore, the coolant level in the storage tank 20 can be determined by observing the coolant level in the light-transmitting section.

[0065] Please see Figure 1 In some embodiments, the flow resistance testing device 100 includes an overflow tank 92 disposed below all the reservoirs 20, the overflow tank 92 having an opening facing the reservoirs 20. Thus, the overflow tank 92 can collect coolant overflowing from the reservoirs 20, reducing coolant pollution to the surrounding environment.

[0066] Specifically, the bracket 10 includes a base 13, and an overflow tank 92 can be installed on the base 13 of the bracket 10. If the coolant in the reservoir 20 is too full and overflows from the top, the coolant can drip into the reservoir 20, preventing the coolant in the reservoir 20 from overflowing and dirtying the ground. The coolant flowing into the overflow tank 92 can also be recycled.

[0067] In some embodiments, the total height of the support 10 is less than or equal to 2m. This results in a lower height for the flow resistance testing equipment 100, facilitating indoor use and convenient measurement of the flow resistance of the liquid storage tank 20.

[0068] Please see Figure 1 In some embodiments, the flow resistance testing device 100 includes a control box 110, which can be electrically connected to the liquid pump 30 to control the operating state of the liquid pump 30.

[0069] In summary, in one embodiment, the flow resistance test of the reservoir 20 is performed as follows: First, the switch 55 on one of the infusion pipes is opened and the switch 55 on the other infusion pipe is closed. Then, the liquid pump 30 is turned on, and the flow control valve 54 and pressure control valve 53 on the inlet pipe 21 are adjusted so that the coolant enters the reservoir 20 under predetermined conditions. Then, the pressure detected by the first pressure gauge 41 and the second pressure gauge 42 is read. Finally, the flow resistance of the reservoir 20 is calculated based on the pressure results detected by the first pressure gauge 41 and the second pressure gauge 42.

[0070] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with the described embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0071] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0072] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A flow resistance testing device, characterized in that, include: Multiple liquid storage tanks are arranged at different heights. Each liquid storage tank is connected to an inlet pipe and an outlet pipe. The liquid storage tanks are used to contain coolant and a flow-blocking component, which is used to create resistance to the flow of the coolant. A liquid pump, wherein the pump inlet of the liquid pump is connected to the liquid outlet pipe and the pump outlet of the liquid pump is connected to the liquid inlet pipe, for providing power for the flow of the coolant; A first pressure gauge and a second pressure gauge are provided, wherein the first pressure gauge is installed on the inlet pipe and the second pressure gauge is installed on the outlet pipe.

2. The flow resistance testing equipment according to claim 1, characterized in that, The flow resistance testing equipment includes an adjustment component for adjusting the coolant inlet parameters of at least one of the liquid storage tanks.

3. The flow resistance testing equipment according to claim 2, characterized in that, The regulating assembly includes a common liquid delivery pipe and a delivery pipe. Multiple liquid inlet pipes are connected to the common liquid delivery pipe, and the delivery pipe is connected to the pump outlet of the liquid pump and the common liquid delivery pipe.

4. The flow resistance testing equipment according to claim 3, characterized in that, The common liquid delivery pipe is set vertically, and multiple liquid inlet pipes are respectively connected to different height positions of the common liquid delivery pipe.

5. The flow resistance testing device according to claim 4, characterized in that, The number of delivery pipes is two, and the two delivery pipes are respectively connected to the common liquid delivery pipe at different height positions. The connection position of one delivery pipe to the common liquid delivery pipe is higher than the highest position of the connection between the multiple liquid inlet pipes and the common liquid delivery pipe, and the connection position of the other delivery pipe to the common liquid delivery pipe is lower than the lowest position of the connection between the multiple liquid inlet pipes and the common liquid delivery pipe.

6. The flow resistance testing equipment according to claim 5, characterized in that, Each of the delivery tubes is equipped with a switch for opening and closing the delivery tube, and the switch enables one of the two delivery tubes to be connected to the common liquid delivery tube.

7. The flow resistance testing equipment according to claim 2, characterized in that, The regulating assembly includes at least one of a pressure control valve and a flow control valve disposed on each of the inlet pipes.

8. The flow resistance testing apparatus according to any one of claims 1-7, characterized in that, Each of the inlet pipes is equipped with a flow meter.

9. The flow resistance testing apparatus according to any one of claims 1-7, characterized in that, The flow resistance testing equipment also includes a return pipe and a return box. Multiple outlet pipes are connected to the return pipe, one end of the return pipe is connected to the return box, and the return box is connected to the pump inlet through a pipeline.

10. The flow resistance testing apparatus according to any one of claims 1-7, characterized in that, The liquid storage tank is equipped with multiple liquid inlet connectors, which are set at different heights, and one of the liquid inlet connectors is connected to the liquid inlet pipe.

11. The flow resistance testing apparatus according to any one of claims 1-7, characterized in that, The liquid storage tank is equipped with a level gauge on its exterior, which is used to indicate the liquid level inside the storage tank.

12. The flow resistance testing apparatus according to any one of claims 1-7, characterized in that, The flow resistance testing equipment includes an overflow tank located below all the liquid storage tanks, the overflow tank having an opening facing the liquid storage tanks.

13. The flow resistance testing apparatus according to any one of claims 1-7, characterized in that, The flow-blocking component is detachably connected to the liquid storage tank.

14. The flow resistance testing apparatus according to any one of claims 1-7, characterized in that, The flow resistance testing equipment also includes a support frame, on which multiple liquid storage tanks are arranged at different heights.

15. The flow resistance testing device according to claim 14, characterized in that, The total height of the support is less than or equal to 2m.

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